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Similarweb
SMWB

109 hedge funds and large institutions have $371M invested in Similarweb in 2025 Q1 according to their latest regulatory filings, with 24 funds opening new positions, 33 increasing their positions, 40 reducing their positions, and 26 closing their positions.

New
Increased
Maintained
Reduced
Closed

49% more call options, than puts

Call options by funds: $9.35M | Put options by funds: $6.27M

3.55% more ownership

Funds ownership: 50.62% → 54.17% (+3.6%)

8% less first-time investments, than exits

New positions opened: 24 | Existing positions closed: 26

3% less funds holding

Funds holding: 112 → 109 (-3)

18% less repeat investments, than reductions

Existing positions increased: 33 | Existing positions reduced: 40

29% less funds holding in top 10

Funds holding in top 10: 7 → 5 (-2)

37% less capital invested

Capital invested by funds: $586M → $371M (-$215M)

Holders
109
Holders Change
-3
Holders Change %
-2.68%
% of All Funds
1.46%
Holding in Top 10
5
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-28.57%
% of All Funds
0.07%
New
24
Increased
33
Reduced
40
Closed
26
Calls
$9.35M
Puts
$6.27M
Net Calls
+$3.08M
Net Calls Change
-$10.8M

Top Buyers

1
CCPM
Cooper Creek Partners Management
New York
+$14.7M
2
MIFH
Migdal Insurance & Financial Holdings
Israel
+$12.9M
3
Wellington Management Group
Wellington Management Group
Massachusetts
+$11M
4
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$9.07M
5
American Century Companies
American Century Companies
Missouri
+$8.97M

Top Sellers

1
NCGI
Next Century Growth Investors
Minnesota
-$9.91M
2
Acadian Asset Management
Acadian Asset Management
Massachusetts
-$8.67M
3
Walleye Capital
Walleye Capital
New York
-$6.78M
4
SSA
Schonfeld Strategic Advisors
New York
-$5.9M
5
Alyeska Investment Group
Alyeska Investment Group
Illinois
-$5.31M
Name Holding Trade Value Shares
Change 		Change in
Stake
PAWC
26
P.A.W. Capital
Connecticut
$2.48M -$1.23M -100,000 -25%
HIM
27
Herald Investment Management
United Kingdom
$2.48M +$3.7M +300,000 New
SMTF
28
Sphera Management Technology Funds
Israel
$2.45M +$1.63M +132,610 +81%
Renaissance Technologies
29
Renaissance Technologies
New York
$2.3M -$1.26M -102,600 -27%
State Street
30
State Street
Massachusetts
$2.27M -$151K -12,288 -4%
Russell Investments Group
31
Russell Investments Group
United Kingdom
$2.24M -$1.07M -86,779 -24%
EIM
32
Essex Investment Management
Massachusetts
$2.17M -$24.7K -2,006 -0.8%
State of Tennessee, Department of Treasury
33
State of Tennessee, Department of Treasury
Tennessee
$2.07M +$2.98M +241,900 +3,083%
TAM
34
Telemark Asset Management
Massachusetts
$1.9M -$863K -70,000 -23%
TI
35
Trexquant Investment
Connecticut
$1.77M +$1.35M +109,208 +105%
JP Morgan Chase
36
JP Morgan Chase
New York
$1.75M +$296K +23,974 +13%
CSS
37
Cubist Systematic Strategies
Connecticut
$1.53M +$1.02M +82,536 +80%
Acadian Asset Management
38
Acadian Asset Management
Massachusetts
$1.53M -$8.67M -703,577 -79%
Voloridge Investment Management
39
Voloridge Investment Management
Florida
$1.35M +$2.01M +162,704 New
Ameriprise
40
Ameriprise
Minnesota
$1.21M +$1.8M +145,865 New
Bank of America
41
Bank of America
North Carolina
$1.16M -$1.69M -136,981 -49%
Two Sigma Investments
42
Two Sigma Investments
New York
$1.07M -$1.56M -126,309 -49%
AIM
43
ARK Investment Management
Florida
$999K -$1.02M -82,923 -41%
OC
44
Oppenheimer & Co
New York
$869K -$75.2K -6,104 -5%
PVM
45
Palogic Value Management
Texas
$864K +$1.29M +104,423 New
PP
46
PDT Partners
New York
$783K +$703K +56,991 +151%
William Blair & Company
47
William Blair & Company
Illinois
$723K -$129K -10,458 -11%
Calamos Advisors
48
Calamos Advisors
Illinois
$696K -$1.07M -86,994 -51%
Northern Trust
49
Northern Trust
Illinois
$686K +$205K +16,649 +25%
LOAMU
50
Lombard Odier Asset Management (USA)
New York
$662K +$986K +80,000 New
1
2
3 4 5

SMWB Hedge Fund Activity: Q1 2025 in Review

109 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in Similarweb (SMWB) for Q1 2025, worth a combined $371M — down 37% from $586M a quarter earlier.

Sellers outnumbered buyers: 26 funds closed out of SMWB and 24 opened new positions — a net loss of 2 holders — while 40 trimmed existing stakes and 33 added.

The largest buyer was Cooper Creek Partners Management, opening a new position worth an estimated $14.7M. The largest seller was Next Century Growth Investors, exiting entirely with an estimated $9.91M sold.

  • 109 institutional investors held Similarweb (SMWB) as of Q1 2025, down from 112 in Q4 2024.
  • Funds reported $371M of Similarweb stock for Q1 2025, down 37% quarter-over-quarter.
  • 24 funds opened new Similarweb positions in Q1 2025 and 26 closed out, a net change of -2 holders.
  • The largest Similarweb buyer in Q1 2025 was Cooper Creek Partners Management, an estimated $14.7M added.
  • The largest Similarweb seller in Q1 2025 was Next Century Growth Investors, an estimated $9.91M sold.

Based on aggregated 13F filings for Q1 2025.